XPPerformance LubricantsWith Soluble Additives
Product Information
extreme pressure properties of the additive protect
bearings under high loads.

Krytox™ lubricant XP products are formulated using
patented soluble additives. Typical perfluoropolyether(PFPE) greases use solid additives for anti-rust, anti-wear,
or extreme pressure performance. These components
are mixed into the grease and held in place by the grease
thickener. In the past, there were no additives available forthe oil, because of the inertness of the oil and insolubilityof available additives.

Krytox™ lubricant XP products are high-quality, ultrahighperformance, anti-friction and anti-rust lubricants.
Formulated with synthetic PFPE fluids, soluble additives,
and the most efficient polytetrafluoroethylene (PTFE)
thickeners available, these lubricants exceed theperformance requirements of most demanding applications.

The Krytox™ lubricant XP line offers greases and oils—witha soluble additive in the oil. The soluble additive won’t be
washed away or left behind with the grease thickener.
These patented additives enhance the performance ofKrytox™ PFPE greases and oils, giving them improved
performance properties. Bearings run quieter and wear
less, because there are no solid additives to make noise.
Lower wear will extend bearing and component life. The
anti-corrosion protection of the additive will reducerusting, and allow longer grease and bearing life. The

Krytox™ lubricant XP products will hold up under
tremendous load conditions, preventing metal-to-metal
contact and, thereby, reducing wear. The long-term antirust properties repel moisture, providing extra protection
against corrosion of metal parts and bearing surfaces.
They also exhibit excellent resistance to water washout
when used in wet environments.
While Krytox™ oils are inert and non-reactive to allelastomers, plastics, and metals, the soluble additives in

Typical Properties of Krytox™ XP Lubricants
Oil

XP 1A1

XP 1A2

XP 1A3

XP 1A4

XP 1A5

XP 1A6

XP 1A7

GreaseXP 2A1

XP 2A2

XP 2A3

XP 2A4

XP 2A5

XP 2A6

XP 2A7

715

32

68

150

220460<–70–104(<–94–220)–63–132(–81–270)–60–154(–76–310)–51–179(–60–355)–36–182(–33–360)–36–182(–33–360)–30–182(–22–360)

Oil Viscosity, cSt
20 °C (68 °F)
40 °C (104 °F)
100 °C (212 °F)

16823615380
30518060
9550
160
18810
240
251600440
42

Oil Viscosity Index—59121124134

134

155

<–70 (<–94)–63 (–81)–60 (–76)–51 (–60)–36 (–33)–36 (–33)–30 (–22)

None

None

None

None

NSF H-1 for XP
1A5 only

None

None

ISO Grade of Base Oil
Estimated UsefulTemperature Range, °C (°F)

Base Oil Pour Point, °C (°F)
Food Contact ApprovalKrytox™

Performance Lubricants

Krytox™ lubricant XP products are new and have not beentested with all materials. It is possible that some reactivity
and damage could occur to some materials. Initial testinghas shown no problems with Teflon™ fluoropolymer,
Kalrez® perfluoroelastomer parts, Viton™ fluoroelastomer,nitrile, and silicone rubbers. There is some reactivity of
the additive with copper, but less so with brass. These
additives have not been tested at all temperatures, anddegradation of performance could occur at elevatedtemperatures over a long period of time.

Water washout of grease from a bearing was tested by
ASTM D1264 at 79 °C (175 °F).

Performance
Wear testing of the additive was done using standard
laboratory tests to demonstrate improved performance.
Four Ball Wear tests on oil with the additive compared tooil with no additive were run according to ASTM D4172
at 1,200 rpm, 20 kg load, 107 °C (224 °F) starting
temperature, and 1 hr duration. The wear scar wasmeasured using a microscope. This method tests thewear prevention properties of the oils.
Test Oil
Krytox™ GPL 105
Krytox™ XP 1A5Wear Scar Size, mm0.440.29

Krytox™ XP 1A5 oil showed a reduction of 34% in wear
over the same viscosity oil with no additive.
Four Ball Wear tests on grease with the additive
compared to grease with a typical solid additive were run
according to ASTM D2266 at 1,200 rpm, 20 kg load,
107 °C (224 °F) starting temperature, and 1 hr duration.
The wear scar was measured using a microscope. Thismethod tests the wear prevention properties of thegreases.
Test Grease
Krytox™ GPL 225
Krytox™ XP 2A5

Test Grease
Krytox™ XP 2A5

Grease Removed
0.25%

Pin and Vee Block tests were conducted according toASTM D3233. The test is a load to failure test that uses
progressive loading on Vee blocks that squeeze a shaft
rotating at 290 rpm. The test terminates when the shaft
seizes and breaks a shear pin or the machine reaches its
top loading of 3,000 lb on the load pressure gauge. The
test pieces are submerged in oil. This method tests theextreme pressure properties of the oil or additive. These
tests were run starting at room temperature.
Test Oil
Krytox™ GPL 105
Krytox™ XP 1A5

Maximum LoadReached, lb
3,000
3,000

Final Torque,in·lb
9651

Krytox™ XP 1A5 oil showed a reduction of 47% in torqueover the same viscosity oil with no additive.
Block on Ring tests were run per ASTM D2714. The
test runs at 72 rpm, with a 100 lb normal load for 5,000cycles. The test is a line contact configuration. The sizeof the wear scar on the test block is measured. The
specimen assembly is partially immersed in the lubricant
sample during the test. This method tests the wear
prevention properties of the oil.
Test Oil
Krytox™ GPL 105Krytox™ XP 1A5

Wear Scar Size, mm
0.800.70

Krytox™ XP 1A5 oil showed a reduction of 12% in wear
over the same viscosity oil with no additive.

Wear Scar Size, mm
0.420.34

Krytox™ XP 2A5 grease showed a reduction of 19% inwear over a current grease with the same viscosity oil andwith additives to reduce wear and corrosion.
Four Ball EP tests were run on grease and oil according toASTM D2783 for oil and ASTM D2596 for grease. Thismethod tests the extreme pressure properties of the oilor additive and its ability to carry heavy loads.
Load Wear Index,
No Additive

Load Wear Indexwith Krytox™ XP Additive%Improvement

OilKrytox™ GPL 103 = 40.9

Krytox™ XP 1A3 = 53.3

30

GreaseKrytox GPL 206 = 127.8

Krytox XP 2A6 = 143.6

12.4

Product™

™

Pin and Vee Block Coupons (Large wear scar on left is from oil with noadditives; the smaller scar on the right shows the effect of Krytox™ XPadditives.)

Krytox™

Performance Lubricants

Bearing NoiseLow BandHigh Band

Oscilloscope(EMCOR) test method. This method uses a double row
self-aligning bearing that is packed with grease. It is a
dynamic test that runs partially submerged in water for
8 hr, sits for 16 hr, runs again for 8 hr, sits for 16 hr, runs
again for 8 hr, and then allowed to sit for an additional
108 hr, which gives a test time of one week. At thistime, the bearing is disassembled, and the outer race isexamined for rusting. The outer race is rated from 0–5
on a standard rating scale, with 0 having no corrosion
and 5 having more than 10% of the surface covered withcorrosion. The water for the test is a modified hard waterthat contains salts and minerals to simulate water that
normally would be found in industrial applications andsimilar in corrosion action to saltwater.

60

95+Off scale(8+ grids)

Test Grease

Final Corrosion Rating
5 (More than 10%)

Solid particles in grease cause bearing noise, andvery large particles can lead to early failure of thebearing. Small bearings and electrical motor bearings
are commonly plagued by noise. Krytox™ lubricant XP
products with soluble additives minimize noise. Variousgreases were tested to show the effects of particles
on noise level in bearings. Any readings above 25 on
the low or high band is considered unacceptable forelectric motor quality. Any amplitude greater than one
grid on the oscilloscope is also unacceptable for electricmotor quality.
Test Grease
Competitive Grease(Large particle additives)
Krytox™ Grease(Small particle additives)

17.5

43

3.3 grids

Krytox GPL 205(No additives)

Krytox™ Grease(No solid additives)

20

19.3

1/4 grid

Krytox™ GPL 225(Standard anti-rust additive)™

Anti-Corrosion ProtectionPerformance of the soluble additives in the Krytox™
lubricant XP line is superior to additives that arecommonly used for anti-corrosion protection inPFPE grease.
The corrosion prevention performance of oil with thesoluble additive was tested against a PFPE oil withno additives using a modified version of ASTM D665.
Cylindrical C-1018 steel coupons were cleaned andcoated with oil. They were allowed to drip for 1 hr, andthen placed into a water bath that was stirred and held at
80 °C (176 °F). They were examined at routine intervals
for corrosion. The water for the test is a modified hardwater that contains salts and minerals to simulate water
normally found in industrial applications, and is somewhat
corrosive and similar in action to saltwater.

Krytox™ XP 2A5

3 (1–5%)0 (No corrosion)

Corrosion prevention was also tested by ASTM B117,
salt spray test. A polished steel test panel that wascoated with a 4 mil coating of Krytox™ XP 2A5 grease andexposed to a 5% salt solution at 95 °C (203 °F) for 100
hr passed with no corrosion forming.
Grease corrosion prevention was also tested by ASTM
D1743. This test uses greased tapered roller bearings
that are rotated to spread the grease, and then are
dipped in water and stored in a 100% relative humidity
environment for two days. The Krytox™ XP 2A5 grease
passed with no rusting.		
Time toFinal Corrosion
Test Oil
Initial Corrosion Rating at 24 hrKrytox™ GPL 105 Less than 1 hr
Severe rusting
Krytox™ XP 1A5None
No rusting visible
An additional test was run with corrosion coupons in
80 °C (176 °F) agitated hard water for five weeks with norusting visible.
Bearing corrosion prevention performance of grease
with the soluble additive was tested against a PFPE
grease with no additives and against a PFPE grease
with standard anti-corrosion additives using the IP-220

The bearing race on the left clearly shows there is no corrosion when
Krytox™ XP additive is present, the bearing in the center shows traces ofrust with standard additives, and the bearing on the right shows heavy
rusting with no additives.

Krytox™

Performance LubricantsCorrosion-Oxidation Stability TestMylar® polyester film and Teflon™ fluoropolymer have beentested with no damage, and additional elastomers are
currently being tested for compatibility with the additives.
Kalrez® perfluoroelastomer parts show the same swellthat happens with pure Krytox™ at high temperatures.
Caution should be used with unlisted materials until
compatibility testing is completed.

Krytox™ lubricant XP oils have been tested in theCorrosion-Oxidation Stability test as per Federal Test
Method 791C, 5308.7. This method tests the abilityof oils to resist oxidation and their tendency to corrode
various metals. Metal specimens are suspended in oil atelevated temperature, and air is blown through the mix.
After completion, the oil is tested to determine the extent
of degradation, and the metal coupons are examined forcorrosion.
Results on Krytox XP 1A5 oil after 168 hr at 122 °C(250 °F)™

Evaporation loss
Increase in viscosity

1.0%
1.7%

Change in weight of metals, mg/cm2
CopperCopper alloy 932
Cadmium
Aluminum
Steel
Magnesium

–0.59
–0.22
–0.01
0.00
0.00
+0.01

Elastomer Compatibility
Elastomer compatibility screening was conducted onKrytox™ lubricant XP products. Additional testing is being
performed to fully characterize if materials are affectedby additives in Krytox™ XP products. The table below
lists the percentage of swelling after 168 or 672 hr ofexposure.

TestTemperature

Krytox™
GPL 105 OilKrytox™
XP 1A5 Oil

Viton™, 672 hr

100 °C (212 °F)
175 °C (347 °F)

0.06
–2.94

0.82
8.18

Silicone, 168 hr

100 °C (212 °F)

–1.24

–4.58

Neoprene, 168 hr

100 °C (212 °F)–2.18

EPR, 168 hr

100 °C (212 °F)–0.70

Nitrile, 672 hr

100 °C (212 °F)
175 °C (347 °F)

Elastomer/ Plastic

–2.24
–2.92

–1.55
–3.06

Storage and Shelf Life
Krytox™ XP series lubricants can develop an odor and aslight amber/pinkish color over time. The Krytox™ XP series
has a three-year shelf life and recommended maximum
operating temperature of 182 °C (360 °F). Testing has
shown that these products retain their anti-rust andanti-wear properties, and perform well past the end of therecommended three-year shelf life. Keep product sealed
and store in a cool, dry place.

The information set forth herein is furnished free of charge and based on technical data that Chemours believes to be reliable. It is intended for use by persons having technical skill, at their own
discretion and risk. The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present
no health or safety hazards. Because conditions of product use are outside our control, Chemours makes no warranties, express or implied, and assumes no liability in connection with any useof this information. As with any material, evaluation of any compound under end-use conditions prior to specification is essential. Nothing herein is to be taken as a license to operate under or arecommendation to infringe any patents.
NO PART OF THIS MATERIAL MAY BE REPRODUCED, STORED IN A RETRIEVAL SYSTEM OR TRANSMITTED IN ANY FORM OR BY ANY MEANS ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING OR OTHERWISEWITHOUT THE PRIOR WRITTEN PERMISSION OF CHEMOURS.

For product information, industry applications, technical assistance, or global distributor contacts, visit krytox.com or within the U.S. and Canada, call 1-844-773-CHEM/2436 oroutside of the U.S., call 1-302-773-1000.
© 2021 The Chemours Company FC, LLC. Krytox™, Teflon™, Viton™, and any associated logos are trademarks or copyrights of The Chemours Company FC, LLC. Chemours™ and theChemours Logo are trademarks of The Chemours Company.
Kalrez® is a registered trademark of E.I. du Pont de Nemours and Company.
Mylar® is a registered trademark of Grafix® Plastics.
Replaces: H-58548-5
C-10297 (3/21)